The number 28438
28438 is a composite number with 8 divisors. Its prime factorisation is 2 × 59 × 241. Divisors (8): 1, 2, 59, 118, 241, 482, 14219, 28438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28438 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28438 is composite. Its prime factorisation is
- 3
The divisors add up to 43560; without 28438 itself that is 15122, so 28438 is deficient (15122 is less than 28438). Euler's totient φ(28438) = 13920 numbers up to 28438 share no factor with it.
- 4
The digits of 28438 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 196 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28438 = 2 \times 59 \times 241 \]
28438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 43560 |
| Euler totient φ(n) | 13920 |
| Square | 808719844 |
| Cube | 22998374923672 |
| Square root | 168.635702 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 196 |
| Scientific notation | 2.8438 × |
28438 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand four hundred and thirty-eight |
| Binary (base 2) | 110111100010110 |
| Octal (base 8) | 67426 |
| Hexadecimal (base 16) | 6F16 |
| Base 3 | 1110000021 |
| As time | 28438 seconds = 7 h 53 min 58 s |
Is 28438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (28438 ÷ 2 = 14219) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28438 a prime number?
No. 28438 = 2 × 59 × 241, so it is divisible by 2.
What are the factors of 28438?
1, 2, 59, 118, 241, 482, 14219, 28438.
What is 28438 in binary?
110111100010110 (hexadecimal 6F16, octal 67426).
What is the square root of 28438?
About 168.6357.
Is 28438 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 28438?
It is a composite number with 8 divisors.